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CATEGORIES:Institute for Energy and Environmental Flows (IEEF
 )
SUMMARY:The dynamics of deep-submarine explosive eruptions
  - Eric Newland (University of Cambridge)
DTSTART;TZID=Europe/London:20221124T113000
DTEND;TZID=Europe/London:20221124T123000
UID:TALK192581AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/192581
DESCRIPTION:Deposits from explosive submarine eruptions have b
 een found in the deep sea\, 1–4 km below the surfa
 ce\, with both flow and fall deposits extending se
 veral km’s over the seafloor. A model of a turbule
 nt fountain suggests that after rising 10–20 m abo
 ve the vent\, the erupting particle‑laden mixture 
 entrains and mixes with sufficient seawater that i
 t becomes denser than seawater. The momentum of th
 e resulting negatively buoyant fountain is only su
 fficient to carry the material 50–200 m above the 
 seafloor and much of the solid material then colla
 pses to the seafloor. The deep-ocean is also host 
 to both local and large-scale currents\, with magn
 itudes varying in the range ua = 0.01-1.0 ms-1 . W
 e explore the interaction of these currents with s
 uch fountains through a series of novel laboratory
  experiments in which particle-laden fountains ris
 e through a uniform crossflow.  Using our experime
 ntal observations\, we categorise the dynamics of 
 these particle-laden fountains in terms of the rat
 ios of (i) the particle fall speed to the fountain
  speed\, and (ii) the current speed to the  founta
 in speed. Using the experimental results\, we deve
 lop and test simple quantitative estimates for the
  average rise height and particle dispersal distan
 ce based on the motion of single-phase fountains i
 n a crossflow. We apply these results to predict t
 he control of eruption rate\, ambient currents and
  particle size distribution on the dispersal of vo
 lcanic particles following deep submarine explosiv
 e eruptions.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3
  0EZ
CONTACT:Catherine Pearson
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